<template>

  <el-container class="home-container">
    <!-- 头部区域start -->
    <el-header>
      <div>
        <img src="../assets/heima.png"
             alt="">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info"
                 @click="logout">退出</el-button>
    </el-header>
    <!-- 头部区域end -->
    <!-- 页面主体区域start -->
    <el-container>
      <!-- 侧边栏start -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button"
             @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域start -->
        <el-menu background-color="#333744"
                 text-color="#fff"
                 active-text-color="#409eff"
                 :unique-opened="true"
                 :collapse="isCollapse"
                 :collapse-transition="false"
                 :router="true"
                 :default-active="activePath">
          <!-- 一级菜单 -->
          <el-submenu :index="item.id + ''"
                      v-for="item in menuList"
                      :key="item.id">
            <!-- 一级菜单的模板区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id] "></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>

            <!-- 二级菜单 -->
            <el-menu-item :index=" '/' + subItem.path "
                          v-for="subItem in item.children"
                          :key="subItem.id"
                          @click="seveNavState('/' + subItem.path)">
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{subItem.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 侧边栏end -->
      <!-- 右侧内容主体start -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
      <!-- 右侧内容主体end -->
    </el-container>
    <!-- 页面主体区域end -->
  </el-container>
</template>

<script>
export default {
  data () {
    return {
      //左侧菜单数据
      menuList: [],
      iconsObj: {
        '125': 'iconfont icon-user',
        '103': 'iconfont icon-tijikongjian',
        '101': 'iconfont icon-shangpin',
        '102': 'iconfont icon-danju',
        '145': 'iconfont icon-baobiao',
      },
      //是否折叠左侧导航栏
      isCollapse: false,
      //被激活的连接地址
      activePath:'',
    }
  },
  created () {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout () {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    //获取所有菜单方法
    async getMenuList () {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menuList = res.data
    },
    //点击按钮，切换菜单的折叠与展开
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    //保存链接的激活状态
    seveNavState(activePath){
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    },
  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}

.el-aside {
  background-color: #333744;
  .el-menu {
    border: none;
  }
}

.el-main {
  background-color: #eaedf1;
}

.iconfont {
  margin-right: 10px;
}

.toggle-button {
  background-color: #4a5064;
  font-size: 10px;
  color: #fff;
  line-height: 24px;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>>